backpack
Knapsack, also known as "rucksack", is a luggage bag with one to two shoulder straps that can hang on the back of human beings. From the use of modern march load items, developed into a modern backpack. Although the structure and materials have improved, but its main structural system is still shoulder strap and luggage bag. As the human body is difficult to rely on both hands to carry heavy objects, so backpack is often used to carry or carry the weight of the preferred tool. According to different applications, outdoor activities such as walking, mountain climbing, hiking, travel and cycling, etc., or daily shopping and school, the use of backpack will be comfortable and lightweight. When the load, such as cargo transport, camping and marching, the backpack design used will be different, for example, will use a more breathable material, the inside with support frame, the weight transferred to the buttocks, or shoulder strap can be added to fill Objects to reduce the pressure on the shoulder and with a belt and so on. ...